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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd712d37640c528dc54848602d66eba64e3e280d4b3c0a468fdcef52f3bb3d9b7' 
  AND token = '01J2q26shuxaQzrAP9xUBgMjla+HelFmz4lf1tgAPQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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