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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885db7d9dcaa35db1b4bd124d24279b8109c54eb985e2941925fb8f798f480a9' 
  AND token = 'FrncCXijY8ofg6BO8NI4PJdnfy2UgmNx6jBo2vBlDtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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