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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d63a3a5fc66b8f5d0e05348c45d81c6d4bd8f5271d1fcf6ea7263ac70dc54f' 
  AND token = 'c6sV9hBqCmmNv3qFPOkp81VjV3sFdKpM1HHogVCGqMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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