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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fca4e76a726345abffa059946346cedc0d15277382ef392cf50403775f6b49' 
  AND token = 'yYSJeqeGAx2EfI7yJq2VA2z7kg/n1NBDHEDqX0uKxm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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