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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e6f77f875a8fc4f0605113554e0f32118dc81ee6bb7f2012e1a5ee9f33da35' 
  AND token = 'aUAZxcUxbiPiS663OyVhOW7CSnCpmBLPMbckpkQ32Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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