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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7c4f4345a3f62dc33937b927116ae828bfc8cb856c5688c47d49d9790eb7c6' 
  AND token = 'bnwXne+brcl99VzATXw4QntfIGbNGIL4nn2JpVS2ByA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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