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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c67d186f4a04f4cb1120f11bde67b2dd0167254c6986d79d9086411b4ad4a6' 
  AND token = 'XIXWkpgYwdJkx35TVkt2cHPvUdQZVoOTqrTiuA/XfT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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