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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfc77ac9bd55bf3231ba8b2c8367575f83921732c84139642fc72ffe6462a62' 
  AND token = 'BmD+ejfgcf0rCROU07F0lL9qXvBQdl2cbEYgQ7XmHkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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