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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fdf2340ce9ec7712d104c4d2a4b30ec9ba3af4aa5b1582de7a495533657841' 
  AND token = 'OixFCAXYUPOAH6Xiqa4ssj91/g5xABL949KdDht5Bgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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