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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b11d0b9c700e818efa57e1ddd8fbbb3bb5ca0576c1168b1d3429d1b301f3a57' 
  AND token = 'hbPS6xG7rK4CdG3kd1c/rpz3HY1rLKHY8OmDVES+WH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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