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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3632ec4fda72db8aecaa5856020f274dde4427c7fe32907812dd3546d8bbe537' 
  AND token = 'z+0Z4lIqoDMXS2e/x8vCjfGjeRY78Mo0omGpV2agPoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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