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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402e4115ec18c58a0a6790f670c3d8d5b29e05b8809ae7833b48d628a70517de' 
  AND token = '4pVdt9zuDi50ETdel7RCejtgJottC5dI2WCLCqWdTGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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