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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee9a8658e1962cd09c198091fd5875d87720cfb1c4237b6c6c69a49ff4d0a30' 
  AND token = 'pBdk4WJ90+WlSh7wAEBeempgdfSlLFR++osZW/7azdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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