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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc14235a1ac9a65bce76d98ab8320d65ea05c109f933df4bc078e10a7a1f965' 
  AND token = '9wlIcLFwQG1jZMFRGp9L3ZE168j7n+XQQECMK9Yh/Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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