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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb67303df58aa3385b2726626f08471e41616b2b272b3c82182d434ebc24aaa' 
  AND token = 'gjhpPrhd72KcL4K0f9h5xCbd7a5L+lGGoNG7iBeWT4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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