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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee1948579b11b052b977935313154aafe30a349a782ea30ba0c80892694be38' 
  AND token = '4rptEyMl7rY7tIwqZ7jNzxlIr/y7jR6NsnMNJX24w00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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