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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a168a7ef9d6711501d3b9c2346da7a5a3eef06adf5e2c0104c2a2d1f057b42' 
  AND token = 'BnmmXdiKZ2t510Mn6fZfWaUqXOI1+9K3RNy4ZZBxT5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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