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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd348e14c4a3be932a0941bca8d72bb071666c2364bfc8c6bf9c69f1261b8214' 
  AND token = 'efDrkW+nSNFi0QsMqxzfnxvZJtV3Ds4Bm3Z1qIUII/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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