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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9283909090d5c79ef2a618bc6de7267dbe7ff2350804ca46f5e28f2dfefa48e0' 
  AND token = '3DF6JKNIEw4u8fTW68t5T6Vd5FQE1eUYOemFd5z/xCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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