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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8de39312b20140c18eba9cbea71ab1e3936a7e7cd38a8ce4f8959fa57c02e7' 
  AND token = '5Fp0HLwDKQUnVuw/iewgaNHo6aKtJhH1H80r8VSuOAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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