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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1abb977b42a5dcb634fe8a7e8eaefa6e94b5af3858a35ce526158e66bdfcd20' 
  AND token = 's8P7/zS5qx8dhbmpuRfnb6eDF2V27Badscx8ztHsry4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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