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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd900a4e26cc626df1c759d49d8f2a30aff05439bf7cd068248855cf0f7ec386' 
  AND token = 'ZjJTf+ZDKEaddJZJr0A+eKLWMVTRPHMcnMtPH9VI0FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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