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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0f45e58e956f1f0fafb2019efa6b920aa956f2acf034480e72bc3e40eb64ee' 
  AND token = 'oWooyzfykrXXoKR0k8Uu3ZnJyTw17OrH/omPdUkW/WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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