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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fdb2194bfa46ac2ba105a0936b0a66baca3a0fb2710bb782d744b59fad3e09' 
  AND token = 'HtXr5WvDlkGnqL57j82c4/n0kg4YTXyyUoMswQSwWds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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