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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9409b1ec94431dd8a9f2daf8f301d959f3168993a30c4641d6cdb97a899d7552' 
  AND token = 'ublTd14zStE4U52f0xdqi8C58D75L1Tyl7R58af80+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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