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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3106ff90b9b99901fb00e1f7faf93a00e7c0c9b53ac92d7f9ce16b0ea5eed75' 
  AND token = 'h30i+PL8unHKuOBc6SIbTwDYnnoQEeEplGvVTRp1fEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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