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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3edc2a72e09dae79e8c541a8a6f5835d0ffb53e46e4091a3824cc2c02db204' 
  AND token = 'U6HdWOlRH6eBIH1g/RGA/ZCFBZflcj7dVoVHIXwQeZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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