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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398c75685e4d6513bcc5cd5dab6ed32ff3126cadd5950539f4224bc565c0c399' 
  AND token = 'Z5gO3Pi9mkX2YLO4Veb3SCjRnat45jb+MnLSSemgFuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}