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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d306e17deb11af2950d21b576b5c1d05c40ef26b368c50ba01b00b4517e2be' 
  AND token = '7VoNwS0ZnJr2vUfMDLE4TcwlSrz1k1D/gtPE95lwb6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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