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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88f8b960bd236b5bd10ce62acdb7a53f375d94c097051b05ab7e810e3cb32d0' 
  AND token = 'X4QlGWgZaz/kxknaUc6/L/q7W3lOI2+yVZiQ+YzuTfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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