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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea61c22c00278c6c38f1b7619d175c000d80b942f343390291c562ceb83c5abf' 
  AND token = 'n6Th1+iChLt/6bAgaGvuxj/zlauuvWOzs192DOI2YOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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