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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4ceb1f5c8b4af3dedab6081cf0cbc7f5f3796c47b0b21f1e01cfed130a8141' 
  AND token = 'B7u0QH73IakdeJg0Lt79d8BpL+nFlEh+N2bTXyFIAcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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