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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a29671ba31126f6b699a9a8edd92c31921e0f667ee3ff1f4298654b8c1ccc7' 
  AND token = 'Pufm1INYcqGmZgf+fBVNLAXMsfRAAU5AB9OHWXfq7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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