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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60aad341dd9520e8dc1aa22ce61505f0e71998895ad2e9fc838ecc977901355f' 
  AND token = 'RHBqZau7uyw22AzpbB5Yi28nAwVXQV5wa+sqRT8BqZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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