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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e73488ccdab56a7b303ae582efc7ae0b2a5c8f0e9bf26603907226f1d13a90e' 
  AND token = 'oIAascr5c8x1u43c8V7xTKxgt+N/Ui9s0LG9QxiBL40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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