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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237881bec8060f7a86c8d6032c7800a0fea7ab81830b98146eb784d3ac1f29a5' 
  AND token = 'HqBWHFyQbIcY5eSJypRX9DWueN/fxXPMLfxVv5o8Vdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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