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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09a6a429f3117434dc22afa7eca85bcdc18d0df926e4948bc59282350de1989' 
  AND token = 'm5EhmQQojIV7SuHGdN9qBy2N5VgWlDBqU4e93vjbBwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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