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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184e7d1949983ccfba80de6ed7d22d0696cbb676628d58aab164150288d1ed9' 
  AND token = '+70kZgdeS+2gcS3ijbQ+/oYfgsvsEBYP/5cxmTd6vRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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