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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940619fb4d7bebec6d4253b20f4b82158708a221ca03b7d6661dfd65a4e161ce' 
  AND token = 'HSNdqL5Q0yn4BS3V0r941cIvVbUr65xWl2qL2kwOGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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