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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f19f0105c7a42375aba7c0ae835be5178128d6f8d4ae811f70e03e8c7fc8435' 
  AND token = 'xVB18WYeJaFs2KvZ+WNSrfnA/Mm5GZHr6z1oJAkzsZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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