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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dce8266ccad1f3f48d7b92c6e20f726da1e613dbca5a6f38f8c350345841ae' 
  AND token = 'y3IekYigm2z6t5tSiTB5UGA0ALkyJtOtfu3zjvvJq6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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