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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1598269bee8d005915316bec2ee7d97d5f57da3f504a0a4443606612803fc07c' 
  AND token = 'z3O2/w8ooyz7ny3vnd/3TptmAIhnNBoGOn+h5xq7RtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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