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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c082b17ca8cd24e727010f17ba1faa6f57f2b887826731171311a8b9108713' 
  AND token = 'beWk93dnBXQmXlEf7LctOATWnx34Evxp7ZvwHD8lg8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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