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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca013fc4b24474f9b84689b4f47ae0953cbf14f7631fbd04963805aca87c70a8' 
  AND token = 'KEop4obrKfWl6fSYgREHXZ8ZYvglqMR+jLxatScTtCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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