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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9992a39eb284640aa566bc41169038ff81aa12c8c9708db7d63ab6d9371a52e' 
  AND token = '5UmCGB+vDTbpoNlOQ1WRTR5O08RZrv436EAiYe2VZtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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