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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6302011ef9a6e893d9dcbbe5c1a7684ffd226d412b386931c355384feb4b3829' 
  AND token = 'elUm1e3Wp7mIM9ZbacpXLIeHmAmbUb4tvgA5RFcM5sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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