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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711b4d0f99247687c3aaa7e3fd867fcb8a03584830a6042d8d49e5d808285943' 
  AND token = 'i+vtD/Md0r8d7NZAp5aiVDt4dOJ6PGikJ1gxT6++bJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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