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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d081d66a5c298cfb1f61a1630a6349f670851bcf99d1646c6b8344b1b7b5a63' 
  AND token = '8cv10dCYgMuIT7JPiyYPv2gbaD/GL/5+mpFa0PcWmqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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