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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6839364712741a4111ab51e333c9b4f321944c702a2327d6c8401bb71775ab7' 
  AND token = 'Z+B/JWg5jQJ9i7G554//5fnSuCqhBpxgDkIDg27gQgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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