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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6d411f0c0fe4753bc3edda34f8bef7783af564697917a1ba926da96b96ac92' 
  AND token = '3frz/np+IsQsmtlpgq1yaznX+eFByTqav8H22du2gOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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