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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b25ba783779ebf3d83f76ad7d1451abc04ac6f3b9d2a7cd8c0cd2255072eccf' 
  AND token = 'ggLje6PTi88pz9fSEvlZaMsswWi9kZcqb+WxL9cH5gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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