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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0413492f0a7f23713ce83c77392b44d12f71d64afbef5c515fc1867b08196cb6' 
  AND token = '7zXpSjtluaM/4nm/6oSiTky2A4gOgxGBrKlRQ0pQ4O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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