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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f5c2bbd4fe63e3f5efe492be752813e08a8955f3bf6addbf279e4e0c481076' 
  AND token = 'Rw3eec13HTCXZL28WyFFxtKQiVCCPzJWk+vIv4RU4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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