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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61b3579031e544173e9307a9bf029c0a1c1251a9f656a10b0f323ebc04ab73d' 
  AND token = 'KIleIV/t2lC4OY8oFRWwKijucI/5MgXskQkw0XZ1oVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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