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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5f8441287ce77c70760e0516fe9b923aa104412b249fb1434c76cd012f381c' 
  AND token = 'NuP4mizlI6MMubxrhPo4wjpgZw5lpFdrPPzTvy17KbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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