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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67db36b8b234f688f50c3330aecad700603fbde2b018ad4c45705a3ba1d4689d' 
  AND token = 'Q5hVrN4dr7qw1yJzubdqNcHjqoMrB5Gp3yN1bEKGS1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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