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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8308606258f658b0cdac562118305ca330f9b08c5a78d5ecac207e180721c081' 
  AND token = '67aqsHknETrXE3J9M1h0VTqY6rM2eG4hV8Kw7zxjWNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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