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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dade5ee1ea2b8c364f1756c175a9b8a645d2fc5b17e6f1b3e1cd0d09c98b8ea' 
  AND token = 'mS5ix77wc+wFyo6gQu0o0ABD72p7dsZay/oyEHmTUA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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