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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84c45c96eec5822b2dd00c8a881f3b9c01a77bd24364b0e92be31d1d9408f74' 
  AND token = 'Zq8s98KSU3lWYa4j9uOrKThbhF7X1qWNzTg/OCq+FIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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