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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69829a705de136501ebbacad8e6c2b93eabb9ba007d7485e18a1f840d7b43f8c' 
  AND token = 'dxlAFrUbl7x8sOa94JewrEGiQc0jcL2aPktfma+8vbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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