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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dc4dc81bcd268fb08337e33535be0bee13bc6b35a742ceaaf248472213dd9b' 
  AND token = 'myx9sDDzbmvCo+rx3AyD2n0LF16TAZDgqIESNBr1TxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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