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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ea2228fbc5389156819c154f9cc47872635b869d487fcf20f258c6de7e6458' 
  AND token = 'xQ6EgdsRc0a37KhYg+7Stxh8Y1UETyH+mrkwyswALsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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