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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a844e6250c26499bcc322c245d53517b0c99aa720b7cf578656a14c45de499a4' 
  AND token = 'w9Ak3kWZfSHokRv8qWJKo2bWLlUZrAQCoCZQZzHd4Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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