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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894c64f473ed67f16f47d2e7c7284fd26fa17037d0972d623b98d26ee0ef0717' 
  AND token = 'dTCiS07rjDbN6PtYVPak+sfQuftSBccQ/m0ivXvZz6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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